US Bridges

Cth Cw (mapleton R over Ashippun River

Fair

Waukesha County, Wisconsin · 0.7M E JCT Cth P · Structure no. P67004400000000

Built
1960
65 years old
Condition
Fair
inspected December 2024
Type
Arch - Deck
Steel
Length
34 ft
2 main spans
Daily traffic
3,200
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Cw (mapleton R over Ashippun River is a steel arch - deck carrying Cth Cw (mapleton R over Ashippun River in Waukesha County, Wisconsin. It was built in 1960, so it is 65 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,200 vehicles a day, projected to reach 3,840 by 2043. The structure is 34 ft (10.4 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCth Cw (mapleton R
CrossesAshippun River
Location0.7M E JCT Cth P
RouteCounty Highway 0CW
CountyWaukesha County
StateWisconsin
Coordinates43.17893, -88.44551
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.2 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckSteel plate
Main spans2
Design loadH 15
Structure length34 ft (10.4 m)
Longest span15 ft (4.7 m)
Deck width32 ft (9.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2022)
Projected traffic3,840 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$238,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth Cw (mapleton R over Ashippun River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Cth Cw (mapleton R over Ashippun River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.

How much traffic does Cth Cw (mapleton R over Ashippun River carry?

About 3,200 vehicles per day (2022 count).

How long is Cth Cw (mapleton R over Ashippun River?

The structure is 34 ft (10.4 m) long with a longest span of 15 ft (4.7 m) and a deck 32 ft wide.

Who owns Cth Cw (mapleton R over Ashippun River?

It is owned by the County Highway Agency.